Xen currently fails to build in x86_64 mock with the following failure:
"No Package Found for /usr/include/gnu/stubs-32.h"
which in turn is caused by the "*-devel.i?86" exclude in mock's yum config.
Xen requires glibc-devel.i386 even on x86_84 because it needs to build the 32
bit BIOS firmware for HVM.

Can't confirm that it works now, but looking at the excludes, it should be fine:
# grub/syslinux on x86_64 need glibc-devel.i386 which pulls in glibc.i386, need to
# exclude all .i?86 packages except these.
exclude=[A-Za-fh-z]*.i?86 g[A-Za-km-z]*.i?86 gl[A-Za-hj-z]*.i?86
gli[A-Zac-z]*.i?86 glib[A-Za-bd-z]*.i?86

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